Re: [PATCH v29 25/32] x86/cet/shstk: Handle thread shadow stack

Yu, Yu-cheng
2021-08-26T17:26:12Z

On 8/26/2021 9:50 AM, Borislav Petkov wrote:
> On Fri, Aug 20, 2021 at 11:11:54AM -0700, Yu-cheng Yu wrote:
>> diff --git a/arch/x86/kernel/shstk.c b/arch/x86/kernel/shstk.c
>> index 5993aa8db338..7c1ca2476a5e 100644
>> --- a/arch/x86/kernel/shstk.c
>> +++ b/arch/x86/kernel/shstk.c
>> @@ -75,6 +75,61 @@ int shstk_setup(void)
>> return err;
>> }
>>
>> +int shstk_alloc_thread_stack(struct task_struct *tsk, unsigned long clone_flags,
>> + unsigned long stack_size)
>> +{
>> + struct thread_shstk *shstk = &tsk->thread.shstk;
>> + struct cet_user_state *state;
>> + unsigned long addr;
>> +
>> + if (!shstk->size)
>> + return 0;
>> +
>> + /*
>> + * Earlier clone() does not pass stack_size. Use RLIMIT_STACK and
>
> What is "earlier clone()"? >

I will make it just "clone()".

Thanks,
Yu-cheng